Here is the full list of all 35 SCP: Secret Laboratory achievements.
Play the Christmas version of the game.
Kill an SCP with the Micro HID.
Use SCP-500 when you're about to die.
Find any gun as a Class-D.
Play the Halloween version of the game.
Cancel the Alpha Warhead detonation within the last 15 seconds of the countdown.
Kill an SCP as a Scientist.
As Class-D, kill a Scientist holding a keycard.
Successfully re-contain SCP-106
Use adrenaline to survive a hit that would otherwise kill you.
Disarm a MTF operative
Die inside the pocket dimension.
Successfully escape from the Pocket Dimension.
Escape as D-Class personnel.
Liberate two or more SCP objects from the facility while escaping as a Class-D.
Survive a successful Alpha Warhead Detonation.
Escape as a Scientist.
As a Scientist, successfully upgrade your keycard alongside any amount of Class-D.
Die within the first minute of the game.
Die from a fall.
Broadcast a 'helpful' message via the Intercom.
As an SCP, kill someone who's charging or firing the MicroHID.
Pick up an O5-Keycard.
Kill yourself with a grenade.
Respawn as Nine-Tailed Fox.
Die from a Tesla Gate burst.
Let SCP-173 snap your neck.
Respawn as Chaos Insurgency.
Cure 10 people in a single game.
Die while entering a rage as SCP-096.
Kill 5 enemies in less than 30 seconds.
Kill 50 D-Class as a Scientist.
Escape the facility in 3 minutes or under.
Escape while under the effects of SCP-207.
Try to recharge the MicroHID.